It wasnarrated that Ibn 'Umar said:
"I was with the Messenger ofAllah(ﷺ) and a man from among the Ansar came to him and greeted theProphet (ﷺ) with Salam. Then he said: 'O Messenger of Allah,whichof the believers is best?' He said: 'He who has the bestmanners amongthem.' He said: 'Which of them is wisest?' Hesaid: 'The one whoremembers death the most and is best inpreparing for it. Those arethe wisest.'" (RU)
English reference (RU): Vol. 5, Book 37, Hadith 4259 (RU)
Arabic reference (RU): Book 37, Hadith 4400 (RU)